From 1a92f4aec18f57ad236005dc51b3c766d47b10fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simon=20L=C3=BCbe=C3=9F?= <simon.luebess@gmail.com>
Date: Sat, 18 Nov 2023 01:04:12 +0100
Subject: [PATCH] Started reworking entity initialisation

---
 GlitchyEngine/src/Scripting/ScriptClass.bf | 71 ++++++++++++++++++++--
 GlitchyEngineHelper/src/Mono/Mono.bf       | 20 ++++++
 2 files changed, 86 insertions(+), 5 deletions(-)

diff --git a/GlitchyEngine/src/Scripting/ScriptClass.bf b/GlitchyEngine/src/Scripting/ScriptClass.bf
index 43046d1..3f1b41f 100644
--- a/GlitchyEngine/src/Scripting/ScriptClass.bf
+++ b/GlitchyEngine/src/Scripting/ScriptClass.bf
@@ -293,7 +293,9 @@ class ScriptClass : SharpClass
 	typealias OnUpdateMethod = function MonoObject*(MonoObject* instance, float deltaTime, MonoException** exception);
 	typealias OnDestroyMethod = function MonoObject*(MonoObject* instance, MonoException** exception);
 
-	private MonoMethod* _constructor;
+	//private MonoMethod* _constructor;
+	private List<MonoMethod*> _constructors ~ delete _;
+
 	//private ConstructorMethod _constructor;
 	private OnCreateMethod _onCreate;
 	private OnUpdateMethod _onUpdate;
@@ -321,7 +323,8 @@ class ScriptClass : SharpClass
 		base(classNamespace, className, image, scriptFieldType)
 	{
 		//_constructor = (ConstructorMethod)GetMethodThunk(".ctor", 1); // GetMethod(".ctor", 1);//
-		_constructor = GetMethod(".ctor", 1);
+		CreateConstructorChain();
+		//_constructor = GetMethod(".ctor", 1);
 		_onCreate = (OnCreateMethod)GetMethodThunk("OnCreate");
 		_onUpdate = (OnUpdateMethod)GetMethodThunk("OnUpdate", 1);
 		_onDestroy = (OnDestroyMethod)GetMethodThunk("OnDestroy");
@@ -333,6 +336,61 @@ class ScriptClass : SharpClass
 		_onCollisionLeave2DMethod = GetMethod("OnCollisionLeave2D", 1);
 	}
 
+	private void CreateConstructorChain()
+	{
+		_constructors = new List<MonoMethod*>();
+
+		MonoClass* @class = _monoClass;
+
+		while (@class != null)
+		{
+			void* iter = null;
+			MonoMethod* method = null;
+
+			while ((method = Mono.mono_class_get_methods(@class, &iter)) != null)
+			{
+				if (StringView(Mono.mono_method_get_name(method)) == ".ctor")
+				{
+					MonoMethodSignature* signature = Mono.mono_method_signature(method);
+					if (Mono.mono_signature_get_param_count(signature) == 1)
+					{
+						void* paramsIterator = null;
+						MonoType* paramType = Mono.mono_signature_get_params(signature, &paramsIterator);
+
+						let name = Mono.mono_type_get_name(paramType);
+
+						// TODO: Compare types with something stored in ScriptEngine
+						if (StringView(name) == "GlitchyEngine.Core.UUID")
+						{
+							_constructors.Add(method);
+						}						
+					}
+				}
+			}
+			
+        	@class = Mono.mono_class_get_parent(@class);
+		}
+	}
+
+	private void CallConstructorChain(MonoObject* instance, UUID uuid, out MonoException* exception)
+	{
+		exception = null;
+
+		if (_constructors.Count == 0)
+			return;
+
+		void*[1] args = void*[](&uuid);
+
+		for (MonoMethod* constructor in _constructors)
+		{
+			// Invoke constructor with UUID
+			MonoObject* result = Mono.mono_runtime_invoke(constructor, instance, &args, (.)&exception);
+			break;
+//#unwarn
+			//ScriptEngine.[Friend]s_EngineObject.Invoke(constructor, instance, out exception, &uuid);
+		}
+	}
+
 	public void OnCreate(MonoObject* instance, out MonoException* exception)
 	{
 		exception = null;
@@ -394,11 +452,14 @@ class ScriptClass : SharpClass
 		MonoObject* instance = Mono.mono_object_new(ScriptEngine.[Friend]s_AppDomain, _monoClass);
 
 		// Invoke empty constructor to initialize fields with default values specified in the script itself
-		Mono.mono_runtime_object_init(instance);
+		//Mono.mono_runtime_object_init(instance);
+
+		// Invoke UUID Constructors:
+		CallConstructorChain(instance, uuid, out exception);
 
 		// Invoke constructor with UUID
-#unwarn
-		ScriptEngine.[Friend]s_EngineObject.Invoke(ScriptEngine.[Friend]s_EngineObject._constructor, instance, out exception, &uuid);
+//#unwarn
+		//ScriptEngine.[Friend]s_EngineObject.Invoke(ScriptEngine.[Friend]s_EngineObject._constructor, instance, out exception, &uuid);
 
 		return instance;
 	}
diff --git a/GlitchyEngineHelper/src/Mono/Mono.bf b/GlitchyEngineHelper/src/Mono/Mono.bf
index 701c1da..0dfce9f 100644
--- a/GlitchyEngineHelper/src/Mono/Mono.bf
+++ b/GlitchyEngineHelper/src/Mono/Mono.bf
@@ -111,6 +111,9 @@ static class Mono
 	[LinkName(.C)]
 	public static extern void mono_runtime_object_init(MonoObject* this_obj);
 
+	[LinkName(.C)]
+	public static extern MonoMethod* mono_class_get_methods(MonoClass* klass, gpointer* iter);
+
 	[LinkName(.C)]
 	public static extern MonoMethod* mono_class_get_method_from_name(MonoClass* klass, char8* name, int param_count);
 
@@ -129,7 +132,19 @@ static class Mono
 	
 	[LinkName(.C)]
 	public static extern gpointer mono_method_get_unmanaged_thunk(MonoMethod *method);
+
+	[LinkName(.C)]
+	public static extern char8* mono_method_get_name(MonoMethod *method);
 	
+	[LinkName(.C)]
+	public static extern MonoMethodSignature* mono_method_signature(MonoMethod *method);
+
+	[LinkName(.C)]
+	public static extern uint32 mono_signature_get_param_count(MonoMethodSignature *sig);
+	
+	[LinkName(.C)]
+	public static extern MonoType* mono_signature_get_params(MonoMethodSignature *sig, gpointer *iter);
+
 	[LinkName(.C)]
 	public static extern mono_bool mono_class_is_subclass_of(MonoClass *monoClass, MonoClass *parentClass,
 		mono_bool check_interfaces);
@@ -166,6 +181,9 @@ static class Mono
 
 	[LinkName(.C)]
 	public static extern MonoClassField* mono_class_get_fields(MonoClass* klass, gpointer* iter);
+
+	[LinkName(.C)]
+	public static extern MonoClass* mono_class_get_parent(MonoClass* klass);
 	
 	[LinkName(.C)]
 	public static extern char8* mono_field_get_name(MonoClassField* field);
@@ -343,6 +361,8 @@ struct MonoObject;
 
 struct MonoMethod;
 
+struct MonoMethodSignature;
+
 struct MonoProperty;
 
 struct MonoThread;